*{
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
a{
  display: block;
  color: inherit;
  text-decoration: none;
}
img{
  display: block;
  width: 100%;
}
ul{
  list-style: none;
}

.clearfix::after{
  content: "";
  display: block;
  height: 0;
  line-height: 0;
  visibility: hidden;
  clear: both;
}

// 头部
html{
  height: 100%;
}
body{
  height: 100%;
  display: flex;
  flex-direction: column;    
}
header{
  width: 100%;
  min-height:50px;  //为什么要用min-height ?
  background-color:rgb(255, 132, 29);
  position: relative;
  .left{
      position: absolute;
      top:30%;
      left:4%;
      width: 140px;
      height: 20px;
  }
  .right{
      position: absolute;
      top:20%;
      right:4%;
      width: 30px;
      height: 30px; 
  }
}

.foot{
  margin-top: 20px;
  background-color: #f2f2f2;
  .Menu {
    font-size: 14px;
    border-top: solid 1px #ebebeb;
    border-bottom: 1px solid #ccc;
    line-height: 36px;
    padding-left: 8px;
    margin-bottom: 8px;
    a {
      display: inline;
    }
  }
  .foot_up{
      border-top: 1px solid #c4c4c4;
      border-bottom: 1px solid #c4c4c4;
      display: flex;
      a{
          width: 33.33%;
          height: 30px;
          display: flex;
          justify-content: center;
          align-items: center; 
          border-right: 1px solid #c4c4c4;
      }
      a:nth-child(3){
        border-right: none;
      }
  }
  .foot_down{
      height: 60px;
      text-align: center;
      font-size: 12px;
      padding: 20px ;
      color:rgb(170, 170, 170);
      border: 1px solid rgb(241, 241, 241);
      a{
          display: inline-block;         
      }
      a:first-child{
          color: red;
      }
      a:nth-child(2){
          color: black;
      }
  }
}